I had no idea those names were invented in literature. The names that come to mind are some from the A Song of Ice and Fire series by George R.R. Martin: Sansa, Daenerys, Rhaegar, Jaehaerys, Aegon, Aerys, Rhaegal, Stannis, Renly, Gendry, Selyse, Viserys, etc.

Those names aren't exactly popular so I'm not sure if that's what you're looking for. Although I love Sansa and Renly and would consider using them.

Cedric-Invented by Sir WalterScott for his novel Ivanhoe, this name may have been a misread of Cerdic. Which is much less attractive than Scott's version of the name.Orville-Invented by writer FannyBurney, who may have been trying to create a name that meant Gold City French (Or-Gold) (Ville-City)Percival-A name created by the poet Chrétien de Troyes for his poem Perceval, the story of the grail. A story based on Arthurian legendCaspian-Although this name was likely inspired by the Caspian Sea, it was first used as a given name by C.S. Lewis for a character in "The Chronicals of Narnia"Dorian-First used by Oscar Wilde for his famous novel "The Picture of DorianGray

Copied and pasted from a website, but a lot of these I really like! Especially Dorian, Caspian, and Fiona